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1. A comparison of zooplankton densities and biomass in Lakes Peipsi and Võrtsjärv (Estonia): rotifers and crustaceans versus ciliates

Author:
Zingel, Priit; Haberman, Juta
Source:
Hydrobiologia 2008 v.599 no.1 pp. 153-159
ISSN:
0018-8158
Subject:
Ciliophora; Copepoda; Rotifera; biomass; food chain; lakes; phytoplankton; zooplankton; Estonia
Abstract:
... The abundance and biomass of ciliates, rotifers, cladocerans and copepods were studied in Lake Peipsi and Lake Võrtsjärv, both of which are shallow, turbid and large. Our hypothesis was that in a large shallow eutrophic lake, the ciliates could be the most important zooplankton group. The mean metazooplankton biomass was higher in Peipsi than in Võrtsjärv (mean values and SD, 1.8 ± 0.7 and 1.3 ± 0 ...
DOI:
10.1007/s10750-007-9186-y

2. Analysis of long-term ecological status of Lake Balaton based on the ALMOBAL phytoplankton database

Author:
Hajnal, Éva; Padisák, Judit
Source:
Hydrobiologia 2008 v.599 no.1 pp. 227-237
ISSN:
0018-8158
Subject:
biomass; community structure; computers; databases; eutrophication; global change; lakes; phytoplankton; statistical analysis; water quality; watersheds; Hungary
Abstract:
... Lake Balaton (Hungary), one of the largest lakes in Europe, has undergone eutrophication and restoration during the last two decades. The first quantitative phytoplankton records date back to the 1930s, and since that time thousands of data have been published or accumulated in counting protocols or computer sheets. These data provide material for both scientific analyses (e.g. effects of global c ...
DOI:
10.1007/s10750-007-9207-x

3. Changes in spatial distribution of phosphorus and nitrogen in the large north-temperate lowland Lake Peipsi (Estonia/Russia)

Author:
Kangur, Külli; Möls, Tõnu
Source:
Hydrobiologia 2008 v.599 no.1 pp. 31-39
ISSN:
0018-8158
Subject:
eutrophication; lakes; lowlands; nitrogen; nitrogen content; nutrient content; nutrients; phosphorus; rivers; statistical analysis; Estonia; Russia
Abstract:
... We investigated changes in the spatial distribution of nitrogen (N) and phosphorus (P) in Lake Peipsi using limnological data from 1970 to 2005. The results show differences in nutrient content between the northern and southern parts of the lake (polarity) and indicate possible causes of eutrophication of this large international lake. The results show a steady gradient in total P (TP) and total N ...
DOI:
10.1007/s10750-007-9204-0

4. Changes in the water level of Lake Peipsi and their reflection in a sediment core

Author:
Punning, Jaan-Mati; Kapanen, Galina; Hang, Tiit; Davydova, Natalia; Kangur, Mihkel
Source:
Hydrobiologia 2008 v.599 no.1 pp. 97-104
ISSN:
0018-8158
Subject:
biogeochemical cycles; chronosequences; environmental impact; lakes; phosphorus; rocks; sediment deposition; soil erosion; surface water level
Abstract:
... A comprehensive study (chronological, lithological and geochemical) of an 8.5 m postglacial sediment sequence from Lake Peipsi was conducted to elucidate the effects of lake-level changes on the sedimentary environment and biogeochemical dynamics in a large lake. Four lithological units were distinguished in the sediment sequence studied: clayey silt, slightly laminated greyish carbonaceous gyttja ...
DOI:
10.1007/s10750-007-9192-0

5. Contributions of DOC from surface and groundflow into Lake Võrtsjärv (Estonia)

Author:
Tamm, Toomas; Nõges, Tiina; Järvet, Arvo; Bouraoui, Faycal
Source:
Hydrobiologia 2008 v.599 no.1 pp. 213-220
ISSN:
0018-8158
Subject:
base flow; climate change; computer software; dissolved organic carbon; hydrologic factors; lakes; overland flow; rivers; subwatersheds; Estonia
Abstract:
... Hydrological changes have the greatest impact on shallow lakes where they alter the water volume and lake depth noticeably. Dissolved organic carbon (DOC), which is markedly affected by hydrological factors, has an important role in many biogeochemical processes. The DOC load supplied to Lake Võrtsjärv, the second largest lake in Estonia, was studied on the scale of the subcatchments discharging i ...
DOI:
10.1007/s10750-007-9189-8

6. Critical N:P ratio for cyanobacteria and N₂-fixing species in the large shallow temperate lakes Peipsi and Võrtsjärv, North-East Europe

Author:
Nõges, Tiina; Laugaste, Reet; Nõges, Peeter; Tõnno, Ilmar
Source:
Hydrobiologia 2008 v.599 no.1 pp. 77-86
ISSN:
0018-8158
Subject:
Anabaena flos-aquae; Aphanizomenon flos-aquae; Gloeotrichia; lakes; nitrogen; nitrogen content; phosphorus; phytoplankton; rivers; summer; water temperature; Europe
Abstract:
... In the 1990s a sharp decrease in nitrogen loading occurred in Estonian rivers, bringing about a reduction of the nitrogen-to-phosphorus ratio (N:P ratio) in the large shallow lakes, Peipsi (3,555 km², mean depth 7.1 m) and Võrtsjärv (270 km², 2.8 m). The average mass ratio of total nitrogen (TN) and total phosphorus (TP) in Võrtsjärv (45) was about twice as high as that in Peipsi (22). In Peipsi, ...
DOI:
10.1007/s10750-007-9195-x

7. Effects of warmer world scenarios on hydrologic inputs to Lake Mälaren, Sweden and implications for nutrient loads

Author:
Moore, Karen; Pierson, Donald; Pettersson, Kurt; Schneiderman, Elliot; Samuelsson, Patrick
Source:
Hydrobiologia 2008 v.599 no.1 pp. 191-199
ISSN:
0018-8158
Subject:
climate; climate change; climate models; hydrology; lakes; nutrients; pollution load; rivers; snowmelt; watersheds; Sweden
Abstract:
... A simple, rapid, and flexible modelling approach was applied to explore the impacts of climate change on hydrologic inputs and consequent implications for nutrient loading to Lake Mälaren, Sweden using a loading function model (GWLF). The first step in the process was to adapt the model for use in a large and complex Swedish catchment. We focused on the Galten basin with four rivers draining into ...
DOI:
10.1007/s10750-007-9197-8

8. Environmental awareness of the permanent inhabitants of towns and villages on the shores of Lake Balaton with special reference to issues related to global climate change

Author:
Várkuti, Anna; Kovács, Kata; Stenger-Kovács, Csilla; Padisák, Judit
Source:
Hydrobiologia 2008 v.599 no.1 pp. 249-257
ISSN:
0018-8158
Subject:
elderly; questionnaires; tourism; water quality; lakes; surveys; landscape management; climate change; villages; seasonal variation; hydrology; summer; towns; biodiversity; storms; environmental education; Hungary
Abstract:
... Lake Balaton, one of the largest lakes in Europe, is an important centre for summer tourism in Hungary. The appearance of the water is, however, influenced by a number of physical and biological factors such as the frequency of storms, the hydrological balance, the water level and the growth of algae. Here we report the results of a survey designed to test the reaction of the local population to t ...
DOI:
10.1007/s10750-007-9190-2

9. Highlights of large lake research and management in Europe

Author:
Nõges, Peeter; Kangur, Külli; Nõges, Tiina; Reinart, Anu; Simola, Heikki; Viljanen, Markku
Source:
Hydrobiologia 2008 v.599 no.1 pp. 259-276
ISSN:
0018-8158
Subject:
altitude; anthropogenic activities; climate change; ecosystem services; ecosystems; environmental law; fauna; flora; food webs; greenhouse gas emissions; harvesting; indigenous species; introduced species; lakes; latitude; natural resource management; oceans; pollution load; research; shorelines; society; surface water; toxicity; watersheds; Caspian Sea; Europe
Abstract:
... Lakes in Europe have a bipolar distribution by latitude with higher lake densities in the north (58-65° N) and south (38-48° N). By area, 95% of the large lakes (>100 km²) are located at altitudes lower than 100 m above sea level (ASL) and only 1% lie higher than 1,000 m ASL. Physically large lakes exhibit several similarities to seas and oceans in their thermal structure and circulation dynamics. ...
DOI:
10.1007/s10750-007-9233-8

10. History of anthropogenically mediated eutrophication of Lake Peipsi as revealed by the stratigraphy of fossil pigments and molecular size fractions of pore-water dissolved organic matter

Author:
Leeben, Aina; Tõnno, Ilmar; Freiberg, Rene; Lepane, Viia; Bonningues, Nicolas; Makarõtševa, Natalja; Heinsalu, Atko; Alliksaar, Tiiu
Source:
Hydrobiologia 2008 v.599 no.1 pp. 49-58
ISSN:
0018-8158
Subject:
biomass; chemical structure; chlorophyll; dissolved organic matter; ecosystems; eutrophication; fossils; lakes; molecular weight; phytoplankton; pigments; pollution load; sediments; stratigraphy; watersheds; Estonia; Russia
Abstract:
... We investigated stratigraphic changes in fossil pigments and the molecular structure of the UV-absorbing fraction of pore-water dissolved organic matter in a sedimentary record from Lake Peipsi (Estonia/Russia) temporally covering the 20th century. The aims of the study were to define the onset of eutrophication in the lake and to track its course. An attempt was also made to reconstruct lake cond ...
DOI:
10.1007/s10750-007-9199-6

11. Implications of flexibility in European Community environmental law: exemptions from environmental objectives in the Water Framework Directive

Author:
Grönlund, Elisabeth; Määttä, Tapio
Source:
Hydrobiologia 2008 v.599 no.1 pp. 221-226
ISSN:
0018-8158
Subject:
environmental law; surface water; water quality
Abstract:
... The present article is a brief review of the legal characteristics of water quality objectives and legally permissible exemptions from these objectives, as enacted in the EC Water Framework Directive. Six different types of exemptions have been identified in total. These vary markedly in the legal premises of their feasibility, ranging from the set deadlines for the environmental objectives to app ...
DOI:
10.1007/s10750-007-9214-y

12. Increasingly ice-free winters and their effects on water quality in Sweden's largest lakes

Author:
Weyhenmeyer, Gesa A.; Westöö, Anna-Karin; Willén, Eva
Source:
Hydrobiologia 2008 v.599 no.1 pp. 111-118
ISSN:
0018-8158
Subject:
Bacillariophyta; air temperature; atmospheric deposition; biomass; climate change; ice; lakes; sulfates; water flow; water quality; water temperature; water utilities; watersheds; winter; Sweden
Abstract:
... Mean global air temperatures have steadily increased during recent decades, resulting in an earlier timing of lake ice breakup. In Sweden's largest lakes, Vänern and Vättern, the breakup of ice has occurred considerably earlier since 1979 and ice-free winters have become more frequent. Comparison between the years when the lakes were ice covered with those when they remained ice-free in terms of 3 ...
DOI:
10.1007/s10750-007-9188-9

13. Models as tools for understanding past, recent and future changes in large lakes

Author:
Blenckner, Thorsten
Source:
Hydrobiologia 2008 v.599 no.1 pp. 177-182
ISSN:
0018-8158
Subject:
land use change; invasive species; simulation models; lakes; water management; ecosystem management; model uncertainty; ecosystems; pollution load
Abstract:
... Large lakes currently exhibit ecosystem responses to environmental changes such as climate and land use changes, nutrient loading, toxic contaminants, hydrological modifications and invasive species. These sources have impacted lake ecosystems over a number of years in various combinations and often in a spatially heterogeneous pattern. At the same time, many different kinds of mathematical models ...
DOI:
10.1007/s10750-007-9210-2

14. Nutrients and phytoplankton in Lake Peipsi during two periods that differed in water level and temperature

Author:
Haldna, Marina; Milius, Anu; Laugaste, Reet; Kangur, Külli
Source:
Hydrobiologia 2008 v.599 no.1 pp. 3-11
ISSN:
0018-8158
Subject:
analysis of variance; biomass; inorganic compounds; lakes; nitrogen; nitrogen content; nutrient content; nutrients; phosphorus; phytoplankton; pollution load; summer; vegetation; water temperature
Abstract:
... Data for the vegetation periods (May-November) of 1985-2003 were used to collate the nutrient content and biomass of the most important phytoplankton groups in Lake Peipsi (Estonia). Two periods differing in external nutrient load and water level were compared by analysis of variance. The years 1985-1988 were characterized by the highest loads of nitrogen and phosphorus, high water level and cool ...
DOI:
10.1007/s10750-007-9208-9

15. Phosphorus fractions and alkaline phosphatase activity in sediments of a large eutrophic Chinese lake (Lake Taihu)

Author:
Zhou, Yiyong; Song, Chunlei; Cao, Xiuyun; Li, Jianqiu; Chen, Guoyuan; Xia, Zhuoying; Jiang, Pinghong
Source:
Hydrobiologia 2008 v.599 no.1 pp. 119-125
ISSN:
0018-8158
Subject:
alkaline phosphatase; eutrophication; lakes; organic matter; phosphates; phosphorus; seasonal variation; sediments; spring
Abstract:
... Spatial, vertical, and seasonal variations in phosphorus fractions and in alkaline phosphatase activity (APA) were investigated in sediments in a large-shallow eutrophic Chinese lake (Lake Taihu) in 2003-2004. The phosphorus content was highest in the most seriously polluted lake area. Iron-bound phosphorus (Fe(OOH)~P) dominated (47% on average) among the phosphorus fractions determined according ...
DOI:
10.1007/s10750-007-9185-z

16. Phytoplankton nitrogen demand and the significance of internal and external nitrogen sources in a large shallow lake (Lake Balaton, Hungary)

Author:
Présing, Mátyás; Preston, Tom; Takátsy, Anikó; Sprőber, Péter; Kovács, Attila W.; Vörös, Lajos; Kenesi, Gyöngyi; Kóbor, István
Source:
Hydrobiologia 2008 v.599 no.1 pp. 87-95
ISSN:
0018-8158
Subject:
ammonium nitrogen; basins; crops; lakes; nitrogen; phytoplankton; sediments; spring; summer; urea ammonium nitrate; water quality; winter; Hungary
Abstract:
... Since the middle of 1990s the trend of Lake Balaton towards an increasingly trophic status has been reversed, but N₂-fixing cyanobacteria are occasionally dominant, endangering water quality in summer. The sources of nitrogen and its uptake by growing phytoplankton were therefore studied. Experiments were carried out on samples collected from the middle of the Eastern (Siófok) and Western (Keszthe ...
DOI:
10.1007/s10750-007-9191-1

17. Plant-associated invertebrates and hydrological balance in the large volcanic Lake Bracciano (Central Italy) during two years with different water levels

Author:
Mastrantuono, Luciana; Solimini, Angelo G.; Nõges, Peeter; Bazzanti, Marcello
Source:
Hydrobiologia 2008 v.599 no.1 pp. 143-152
ISSN:
0018-8158
Subject:
macrophytes; littoral zone; Gastropoda; lakes; water mites; global warming; Nematoda; hydrologic models; Italy; Mediterranean region
Abstract:
... Lakes in the Mediterranean region experience an altered hydrological balance with large water level reductions and/or fluctuations within and between years. To date, little is known about the reaction of invertebrate assemblages inhabiting the littoral zone to water level changes in natural lakes. Here, we present the case of the volcanic Lake Bracciano, one of the largest and deepest Italian lake ...
DOI:
10.1007/s10750-007-9196-9

18. Pollen, diatom and plant macrofossil assemblages indicate a low water level phase of Lake Peipsi at the beginning of the Holocene

Author:
Hang, Tiit; Kalm, Volli; Kihno, Kersti; Milkevičius, Martynas
Source:
Hydrobiologia 2008 v.599 no.1 pp. 13-21
ISSN:
0018-8158
Subject:
lakes; watersheds; flora; ice; sand; pollen; Bacillariophyta
Abstract:
... During the Fennoscandian ice recession from the eastern Baltic area, the water level in the Lake Peipsi basin was decreasing and reached a minimum at the end of the Younger Dryas Chronozone. The low lake level episode is represented in the basal deposits by a ca. 0.8 m thick bed of coarse detritus gyttja dated to 9.6-9.1 ka ¹⁴C BP. The gyttja lies at an elevation of 20-21 m a.s.l., i.e. about 9 m ...
DOI:
10.1007/s10750-007-9205-z

19. Rates of change in physical and chemical lake variables - are they comparable between large and small lakes

Author:
Weyhenmeyer, Gesa A.
Source:
Hydrobiologia 2008 v.599 no.1 pp. 105-110
ISSN:
0018-8158
Subject:
atmospheric deposition; phytoplankton; morphometry; lakes; sulfates; calcium; nitrate nitrogen; magnesium; climate change; spring; watersheds; surface temperature; ecosystems; surface water; climate; Sweden
Abstract:
... Changes over time in 16 physical and chemical variables were analysed and compared between Sweden's largest lakes, Vättern and Vänern, and 48 smaller Swedish reference lakes during spring over the period 1984-2003. The rates of changes varied substantially among lakes and among variables, and they were clearly influenced by changes in both climate and atmospheric deposition. Rates of change of var ...
DOI:
10.1007/s10750-007-9193-z

20. Recent trends in Lake Ladoga ice cover

Author:
Karetnikov, Sergey G.; Naumenko, Mikhail A.
Source:
Hydrobiologia 2008 v.599 no.1 pp. 41-48
ISSN:
0018-8158
Subject:
aircraft; climate change; ice; image analysis; lakes; satellites; surveys
Abstract:
... The condition of the ice on a large lake is an important sensitive indicator of regional climate change. We have investigated the ice regime on Lake Ladoga using aircraft surveys and satellite images. Nearly 1,000 surveys of the lake's ice cover covering the years from 1943 to the present were analyzed to determine the first basic statistical characteristics of Ladoga ice cover based on long-term ...
DOI:
10.1007/s10750-007-9211-1

21. Relations of phytoplankton in situ primary production, chlorophyll concentration and underwater irradiance in turbid lakes

Author:
Arst, Helgi; Nõges, Tiina; Nõges, Peeter; Paavel, Birgot
Source:
Hydrobiologia 2008 v.599 no.1 pp. 169-176
ISSN:
0018-8158
Subject:
chlorophyll; lakes; light intensity; models; phytoplankton; primary productivity; surface water; turbidity; wavelengths
Abstract:
... In order to study the relationships among primary productivity, chlorophyll content and light conditions (underwater quantum irradiance, diffuse attenuation coefficient) in turbid lakes, we performed a series of measurements in three Estonian lakes (Peipsi, Võrtsjärv and Harku) during 2003-2005. We focused on (1) comparison of in situ vertical profiles of planar and scalar quantum irradiances in t ...
DOI:
10.1007/s10750-007-9213-z

22. Seasonality and trends in the Secchi disk transparency of Lake Ladoga

Author:
Naumenko, Mikhail A.
Source:
Hydrobiologia 2008 v.599 no.1 pp. 59-65
ISSN:
0018-8158
Subject:
autumn; lakes; latitude; longitude; seasonal variation; spatial data; spring; summer; variance; Europe
Abstract:
... Data on Secchi disk transparency in Lake Ladoga, the largest lake in Europe, collected between 1905 and 2003, were used to detect climatic (interannual) trends for lake regions with various depths. The seasonal variations in Secchi depth (D s) during the ice-free period both for limnetic regions with large differences in bathymetric characteristics and for the whole lake were estimated by more tha ...
DOI:
10.1007/s10750-007-9198-7

23. Silicon load and the development of diatoms in three river-lake systems in countries surrounding the Baltic Sea

Author:
Nõges, Peeter; Nõges, Tiina; Adrian, Rita; Weyhenmeyer, Gesa A.
Source:
Hydrobiologia 2008 v.599 no.1 pp. 67-76
ISSN:
0018-8158
Subject:
Bacillariophyta; lakes; river water; rivers; silicon; watershed hydrology; Baltic Sea; Estonia; Germany; Sweden
Abstract:
... We studied the formation of dissolved silicon loads from rivers to lakes, the development of diatoms in lakes and the role of climatic forcing on the silicon cycle in three river-lake systems in Sweden, Estonia and Northern Germany. We found coherent seasonality in the silicon loads of the two northern rivers, which was probably caused by the common snow-type hydrology of the catchments as distinc ...
DOI:
10.1007/s10750-007-9194-y

24. Spatiotemporal and long-term variation in phytoplankton communities in the oligotrophic Lake Pyhäjärvi on the Finnish-Russian border

Author:
Holopainen, Anna-Liisa; Lepistö, Liisa; Niinioja, Riitta; Rämö, Anita
Source:
Hydrobiologia 2008 v.599 no.1 pp. 135-141
ISSN:
0018-8158
Subject:
biomass; community structure; lakes; littoral zone; phytoplankton; research projects; seasonal variation; species diversity; water quality; watersheds
Abstract:
... As part of the joint Finnish-Russian research and development project “Assessment of the ecological state of the transboundary waters”, seasonal and spatial variations in the phytoplankton communities of Lake Pyhäjärvi were studied in order to identify possible long-term (1963-2002) changes and to present recent data (since 2002) on phytoplankton biomass and species composition. Some changes in bo ...
DOI:
10.1007/s10750-007-9203-1

25. The ice cover on small and large lakes: scaling analysis and mathematical modelling

Author:
Leppäranta, Matti; Wang, Keguang
Source:
Hydrobiologia 2008 v.599 no.1 pp. 183-189
ISSN:
0018-8158
Subject:
climate change; euphotic zone; ice; lakes; mathematical models; oxygen; ridging; snow; stratigraphy; temperature
Abstract:
... Lake ice cover is described by its thickness, temperature, stratigraphy and overlying snow layer. When the ratio of ice thickness to lake size is above ~10-⁵, the ice cover is stable; otherwise, mechanical forcing breaks the ice cover, and ice drifting takes place with lead-opening and ridging. This transition enables a convenient distinction to be made between small and large lakes. The evolution ...
DOI:
10.1007/s10750-007-9201-3

26. The impact of the invasive Ponto-Caspian amphipod Pontogammarus robustoides on littoral communities in Lithuanian lakes

Author:
Gumuliauskaitė, Simona; Arbačiauskas, Kęstutis
Source:
Hydrobiologia 2008 v.599 no.1 pp. 127-134
ISSN:
0018-8158
Subject:
Asellus aquaticus; Gammarus; biomass; community structure; habitats; indigenous species; lakes; species diversity
Abstract:
... The intentionally introduced Pontogammarus robustoides is the most successful amphipod invader of Lithuanian inland waters and has become established in large lakes. Its impact on littoral invertebrate communities was studied by comparing similar habitats across lakes that harbour or are devoid of the invader. In habitats where P. robustoides is well established and numerous, it significantly redu ...
DOI:
10.1007/s10750-007-9209-8

27. Towards ecological goals for the heavily modified lakes in the IJsselmeer area, The Netherlands

Author:
Lammens, Eddy; van Luijn, Francien; Wessels, Yolanda; Bouwhuis, Harry; Noordhuis, Ruurd; Portielje, Rob; van der Molen, Diederik
Source:
Hydrobiologia 2008 v.599 no.1 pp. 239-247
ISSN:
0018-8158
Subject:
macrophytes; water supply; eel; watersheds; European Union; nutrients; fisheries; wind; bream; lakes; land restoration; multivariate analysis; surface water; estuaries; water quality; agricultural land; drinking water; risk reduction; pollution load; vegetation; water table; Netherlands
Abstract:
... The European Water Framework Directive (WFD) obliges EU member states to define ecological goals for water bodies and, if necessary, to take measures to achieve these goals by 2015. The goals and measures for the water bodies in the IJsselmeer area of The Netherlands are elaborated in this study, following an approach described by Irmer & Pollard (2006, Alternative methodology for defining Good Ec ...
DOI:
10.1007/s10750-007-9202-2

28. Validation of the MERIS products on large European lakes: Peipsi, Vänern and Vättern

Author:
Alikas, Krista; Reinart, Anu
Source:
Hydrobiologia 2008 v.599 no.1 pp. 161-168
ISSN:
0018-8158
Subject:
chlorophyll; color; image analysis; lakes; monitoring; oceans; optical properties; organic matter; sediments; spectrometers; summer; temporal variation; Estonia; Russia; Sweden
Abstract:
... The Medium Resolution Imaging Spectrometer (MERIS/Envisat) was launched in March 2002 for coastal zone monitoring. Preliminary data from MERIS show that its imagery of large lakes is superior to that of other common ocean colour sensors. The main objective of the present study is to evaluate the MERIS data on large European lakes, Vänern and Vättern in Sweden and Peipsi in Estonia/Russia. In these ...
DOI:
10.1007/s10750-007-9212-0

29. Variability of bio-optical parameters in two North-European large lakes

Author:
Paavel, Birgot; Arst, Helgi; Reinart, Anu
Source:
Hydrobiologia 2008 v.599 no.1 pp. 201-211
ISSN:
0018-8158
Subject:
bioactive properties; chlorophyll; dissolved organic matter; lakes; optical properties; regression analysis
Abstract:
... The bio-optical properties of some North-European large lakes were examined during 1995-2005 using field data and laboratory measurements. The key variables were optically active substances (OAS: chlorophyll, total suspended matter and dissolved organic matter), Secchi depth, and the “spectrometric” and diffuse light attenuation coefficients. Our main study sites were Lake Peipsi and Lake Võrtsjär ...
DOI:
10.1007/s10750-007-9200-4

30. Water level changes in a large shallow lake as reflected by the plankton:periphyton-ratio of sedimentary diatoms

Author:
Heinsalu, Atko; Luup, Helen; Alliksaar, Tiiu; Nõges, Peeter; Nõges, Tiina
Source:
Hydrobiologia 2008 v.599 no.1 pp. 23-30
ISSN:
0018-8158
Subject:
Bacillariophyta; alkalinity; eutrophication; fly ash; lakes; nutrients; pH; sediments; statistical analysis; temperature; water quality; wind; Estonia
Abstract:
... Biostratigraphic diatom analyses were carried out on a short sediment core from the large shallow-water Lake Võrtsjärv, Estonia, in order to relate the diatom composition to the instrumental water level record. We dated the sediment core by radiometric methods (²¹⁰Pb, ¹³⁷Cs, ²⁴¹Am) and spheroidal fly-ash particle abundance chronology and evaluated the statistical significance of the relationships ...
DOI:
10.1007/s10750-007-9206-y